10.1.6 A Complete C++ Example

This section demonstrates the use of a C++ parser with a simple but
complete example. This example should be available on your system,
ready to compile, in the directory .../bison/examples/calc++. It
focuses on the use of Bison, therefore the design of the various C++
classes is very naive: no accessors, no encapsulation of members etc.
We will use a Lex scanner, and more precisely, a Flex scanner, to
demonstrate the various interactions. A hand-written scanner is
actually easier to interface with.